While running Java applications, sometimes you may have to set JAVA_HOME environment variable. Here are the instructions to quickly set JAVA_HOME on your MAC OS. Open Terminal To Confirm if you have Java Type command: "which java" Hit Enter/Return button The command should return something like this: /usr/bin/java To get location of Java (detailed steps are documents here ) Type command: /usr/libexec/java_home Hit Enter/Return button The command should return something like this: /Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home To Set JAVA_HOME for single session Type command: export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home Hit Enter/Return button Type command to verify: echo $JAVA_HOME To Set JAVA_HOME permanently Type command: vi ~/.bash_profile This will open bash_profile file Go to the end, and add following lines JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.7.0_79.jdk/Contents/Home export JA...